Book is bit on the expensive side

While browsing on eBay I came across a very expensive book.

There was no explanation of why this book, published in 2000, should cost so much: you could definitely buy a house for that amount where I live – whether you’d want to live in it in this area is a different matter:) There's not much information on it online either (not that I looked hard). Only that it's slightly cheaper on Amazon.

The site of the author of this tome doesn't give any indications why two book sellers should value it at six figures bar a penny for one and two pence for the other. Oh, plus £2.75 shipping.